Ammonia oxidising populations and relationships with N2O emissions in three New Zealand soils

Nitrous oxide (N ₂O) emissions from intensively grazed pasture systems contribute significantly to total greenhouse gases. A series of field-plot experiments were conducted at three geographically separated sites to study the ammonia oxidising microbial populations and their relationships with N ₂O...

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Bibliographic Details
Published in:New Zealand journal of agricultural research 2014-09, Vol.57 (3), p.228-243
Main Authors: Podolyan, A, Di, HJ, Cameron, KC, Clough, T, de Klein, C, Saggar, S
Format: Article
Language:English
Subjects:
Ammonia
AOA
AOB
bacteria
DCD
Emissions
Environmental aspects
gene dosage
greenhouse gas emissions
greenhouse gases
nitrate
Nitrification
nitrification inhibitor
Nitrous oxide
pastures
soil
Soils
urine
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Summary:Nitrous oxide (N ₂O) emissions from intensively grazed pasture systems contribute significantly to total greenhouse gases. A series of field-plot experiments were conducted at three geographically separated sites to study the ammonia oxidising microbial populations and their relationships with N ₂O emissions. Our results support the findings from earlier incubation experiments, showing that growth of ammonia oxidising bacteria (AOB), and not ammonia oxidising archaea (AOA), was stimulated by the high concentration of urine. There was substantial spatial variability of the AOB and AOA amoA gene copy numbers at different sites and within replicate samples. AOB abundance was generally higher in the top 2.5 cm compared with the top 10 cm of soil, whereas the opposite trend was observed for AOA. Positive relationships were found between the N ₂O emissions and AOB abundance, although the relationship varied at the three sites.
ISSN:1175-8775
0028-8233
1175-8775
DOI:10.1080/00288233.2014.924969